Weigket hoisting- and releasing mechanism



M. F. HEALY.

WEIGHT HOISTING AND RELEASING MECHANISM,

APPLICATION FILED lULY 21.1919.

1,3%,688., Patented Nov. 4, 1919.

avwemboz MAURICE IE. HEALY, OF WATERTOWN, MASSACHUSETTS.

WEIGHT HOISTING AND RELEASING MECHANISM.

Specification of Letters Patent.

Patented Nov. 4, 1919.

Application filed July 21, 1919. Serial No. 312,442.

(FILED UNDER THE ACT or MARCH 3, 1883, 22 STAT. I.., 625.

, is a (specification.

The invention described herein may be used by the Government, or any of its officers or employees in prosecution of work for the Government, or by any other person in the United States, without payment of any royalty thereon.

This invention relates, generally, to ingot breaking machines in which a weight elevating mechanism is employed, and in which the weight is automatically releasable at a predetermined point in the upward movement of the elevating mechanism; but the invention is applicable for use in other situations, as for instance, in pile or post drivers.

One of the objects is to provide novel means for automatically releasing the weight at a predetermined point in the upward.

movement of the elevating mechanism.

Another object is to provide a novel mechanism for automatically engaging the elevating mechanism with the weight upon descent of the weight elevating mechanism.

A subsidiary object is a novel construction, of the character noted, possessing extreme simplicity and also reliability and positiveness of action.

Other objects will appear as the specification proceeds and the nature of the invention is more fully disclosed.

WVith these objects in view, the invention resides, generally stated, in a weight elevating mechanism embodying complemental grappling jaws, a locking member normally holding the jaws in closed or grappling position, and means for automatically moving said locking member to inoperative position at a predetermined point in the upward movement of the elevating mechanism, thus permitting the jaws to open by the pressure of the weight, which thereupon drops.

More specifically, the invention resides in a novel construction of the jaws which are provided with recessed portions, forming tongues which overlap both in the open and the closed position of thejaws, said tongues being provided with notches which register when the jaws are closed.

The invention resides, finally, in certain specific improvements going to make up the ultimate perfection of the entire mechanism.

' The invention in its preferred form is disclosed in the accompanying drawings, in which Figure 1 is a View in longitudinal section of the slide, the jaws and associated parts being shown :in elevation; and

Fig. 2 is a detached detail view of the jaws.

Referring, ings:

The slide forming part of the weight elenow, in detail to the drawvating or hoisting mechanism may be of the usual construction, and, as here shown, comprises two parallel framemembers or panels, one of which, designated by the numeral 1, is shown in the drawing, between which, near the ends thereof, are disposed, transversely, spacing members 22 secured to said frame members by suitable fastening means, such as bolts 3. Between the portions 4 -4 of the frame members which project beyond the spacing members 2-2 fit the guiding rails on which the slide moves, as usual, the drop weight, not shown, being grooved longitudinally at the sides thereof so as to fit the rails, the slide and the1 weight thereby moving on the same ra1 s.

Pivotally supported on the pivot pins 55 extending transversely through the slide members 1-1 are grappling aws 66, each of which is provided with a cut-away portion 7 for the reception of the lateral portion or lip 8 of the other jaw. Opening movement of the jaws is limited by the lip or tongue 8 of each jaw contacting with the wall 9 of the cut-away portion 7 of the other jaw, as is obvious. By the construction described, it will be seen that the jaws overlap both in the open and closed position thereof. Each jaw is roughly of segmental shape, so that, in the closed position thereof, they provide a circular aperture 10.

now describe' Fulcrumed at 14 to the slide is a rock shaft 13 bent at 15 so as to project through a'slot 16 in one of the frame members 1. After passing through said slot, said shaft isagain bent to provide an arm 13 extending eXteriorly' of the slide parallel therewith.

Carried by said rock shaft is a depending latch 20,-whieh, when the jaws are closed, moves by gravity into the registering notches 1111, thereby locking the jaws in such closed position. The rock shaft carries a weight 17 at one end thereof, which weight may be adjustable on the rock shaft lengthwise thereof. Pivoted to the other end of the rock shaft, as at 19, is a dog 18 provided with an inclined rear edge 19 bearing against a correspondingly shaped wallof the arm 13 thereby preventing movement of said dog independent of said arm in one direction. Arranged in the path of movement of the dog, as the slide is drawn up- 1 ward, is a tripper 28 provided with a lower inclined or beveled surface 29, against which said dog contacts,'thereby throwing the rock shaft and withdrawing the latch 20 from the notches 11-11, whereupon the jaws open under the stress of the weight, and the weight drops. Upon descending movement of the slide, the arm of the dog 18 contacts with the upper end of the tripper 28 and moves on its pivot so as to brush by the tripper. In the descending movement of the slide, the jaws remain open until the eye bolt 22 passes between the open ends of the' jaws and contacts with the bottom. surface of the overlapping portions 8-8, which upward stress on the jaws causes them to swing on their pivots to closing position. veniently, the eye-bolt 22, provided with a screw threaded portion 2 1, is screwed into the weight, and this eye-bolt is engaged by the jaws 66 meeting through the eye 23.

Preferably, the links 25-25 are pivoted at their lower ends on the pivot pins 5-5, and a ring 26 passes through said links, the end link 27 of the hoisting chain engaging said ring 26.

' Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent isz' Conupward movement of the slide.

2. In a hoisting mechanism, the combination with" a vertically movable slide, of grappling jaws pivotally carried thereby and provided with notches which register when the jaws are in closed position, a

latch normally seated in said notches and preventing opening of said jaws, and means "for automatically withdrawing said latch from said notches at a predetermined period in the upward movement of the slide.

3. In a hoisting mechanism, the combination with a vertically-movable slide, of grappling jaws carriedthereby and provided with recessed. portions forming tongues, said tongues being provided with notches, which register when the jaws are in closed position, a latch normally seated in said notches and preventing opening of said jaws, and means for automatically withdrawing said latch from said notches at a predetermined period in the upward movement of the slide.

4. In a hoisting mechanism, the combination'with a slide, of grappling jaws carried thereby and provided with notches which register when the jaws are in closed position, a latch normally seated in said notches and preventing opening of said jaws, a I

rock shaft carried by said slideand carrying said latch, and means for rocking's'aid shaft at a predetermined period in the upward movement of said slide, thereby withdraW- ing said latch from said notches.

5. In a hoisting mechanism, the combination with a slide, of grappling jaws carried thereby and provided with notches which register when the jaws are in closed'position, a latch normally seated in said notches and preventing opening of said jaws, a rock shaft carried by said slide and carrying said latch, means for rocking said shaft at a predeterminedperiod in the upward'movement of said slide, thereby withdrawing said latch fromsaid notches, and a weight carried on the end of said rock shaft and slidable longitudinally thereon.

6. In a hoisting mechanism, the combination with a slide, of grappling jaws carried thereby and provided with notches which register when the jaws are in closed position, a latch normally seated in said notches and preventing opening of said jaws, a rock shaft carried by said slide and carrying said latch, said rock shaft being provided at one end with a pivoted dog movable in jaws are in closed position and provided one direction only on its pivot, and means also with flanges extending along one side for engaging said dog at a predetermined wall of said notches, of a latch normally 10 period in the upward movement of the slide. seated in said notches, and means for with- 7. In a hoisting mechanism, the combinadrawing said latch at a predetermined point tion with a slide carrying grappling jaws in the upward movement of the slide. having notches which register when the MAURICE F. HEALY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of ZPatents.

Washington, D. 0. 

